US3685224A - Method of advancing a prestressed concrete bridging structure - Google Patents

Method of advancing a prestressed concrete bridging structure Download PDF

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Publication number
US3685224A
US3685224A US58864A US3685224DA US3685224A US 3685224 A US3685224 A US 3685224A US 58864 A US58864 A US 58864A US 3685224D A US3685224D A US 3685224DA US 3685224 A US3685224 A US 3685224A
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Prior art keywords
pier
sliding
slide
abutment
advancing
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Expired - Lifetime
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US58864A
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English (en)
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Pierre Launay
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Individual
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Individual
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/04—Bearings; Hinges
    • E01D19/048—Bearings being adjustable once installed; Bearings used in incremental launching

Definitions

  • ABSTRACT Foreign Application Priority Data A method of advancing a prestressed bridging structure over a pier in 'which the pier is provided with a Aug. 26, 1969 France ...6929212 Sliding Surface being a p of a cylinder the concavity of which is directed toward the pier and whose [52] US. Cl. ..52/173, 52/223, 52/745 generatrix is perpendicular to the vertical plane com [51] IIiLCl. ..E04h 14/00, E046 3/10 taining the bridge axis whereby Support pieces [58] Field of Search....
  • a prestressed concrete bridging structure of this type generally consists of prestressed concrete sections which are successively cast on a prefabrication zone and then successively interconnected with temporary prestressing of the connection between two adjacent sections, the assembly then being progressively pushed from an abutment by sliding on the piers and abutments after each new section has been added. Thetemporary prestressing can then be removed after final prestressing of the assembly in its final position.
  • Advancing methods are known wherein the connected assembly slides on the piers or abutments with the interposition of sliding supports which remain connected to the assembly during the movement and which slide on slide surfaces disposed on the piers or abutments, and the connected assembly is pushed by incremental thrusts, each incremental cycle successively comprising a thrusting stage, followed by lifting of the assembly, and then lowering of the assembly which then once again rests on the piers and abutments through the agency of the sliding supports.
  • the present invention provides a practically continuous advance of the structure and according to the invention the sliding surface of each pier or abutment consists of a cylindrical surface whose generatrices are perpendicular to the axial plane of the structure and whose directrix is a continuous curve the concavity of which faces the corresponding pier or abutment, and the sliding of the structure is produced by continuous thrusts of an amplitude greater than the dimension of the pier heads in the direction of advance, the sliding supports being successively introduced between the structure and the upstream part of each slide surface, and collected at the downstream part of each slide surface.
  • FIG. 1 diagrammatically illustrates a deck being advanced by the method according to the invention.
  • FIG. 2 is a detail of the connection between successive sections.
  • FIG. 3 is a partial diagrammatic longitudinal section of the top part of an intermediate pier.
  • the bridge comprises an abutment pier 1 and intermediate piers 2, 3, 4 etc.
  • the bridge deck consists of successive sections 6, 7 l2,
  • Section 16 which are cast with temporary longitudinal prestressing at a prefabrication zone 13.
  • Section 16 is being made in the drawing. As the deck advances, the successive sections are connected together as shown in FIG. 2. The assembly formed by two adjacent sections is temporarily prestressed by cables 14.
  • the abutment pier l is provided with a framework 17 which acts as a support for two long-stroke hydraulic jacks 18 each disposed on either side of the deck.
  • the rod of each jack 18 is connected by a tie-rod 20 to a securing bracket 19 fixed on the section.
  • the top part of an intermediate pier 2 comprises a curved slide member formed by a slab 23 of concrete covered by a stainless steel plate 24.
  • the top surface of the slab 23 and the plate 24 have a cylindrical shape with horizontal generatrices perpendicular to the central plane of the structure.
  • directrix of this cylindrical surface in the axial plane of the structure is an arc of a large-radius .circle whose center is situated on the pier axis, i.e., the slide member 22 is symmetrical with respect to the pier axis.
  • the slabs 25 and 26, the height of which is slightly less than the lowest part of the slide member 23, are disposed on either side of the member 23 in the direction of movement 27.
  • the pier 2 is equipped with a set of hydraulic jacks 31 disposed in special housings and each resting on a neoprene distribution plate 32.
  • the bridge deck 8 rests on the slide member 23 by means of independent slide shoes 35, 36, 37, 38.
  • Each of these shoes e.g., shoe 35, consists of a slab of reinforced elastomer 39, the bottom surface of which is covered by a sheet of cellular tetrafluoroethylene 40.
  • the height of arc of the curved slide member 23 is greater than the maximum crushing deformation of the elastomer.
  • the slide shoes 35, 36, 37 and 38 can easily slide between the deck 8 and the slide member 23.
  • the shoe 35 which is initially placed on the slab 25 is pushed manually or by mechanical means until it is in contact with the shoe 36.
  • the coefficient of friction on the deck underside is very much greater than its coefficient of friction on the plate 24 of the slide member 22.
  • the shoe 36 has been driven and starts to participate in supporting the structure.
  • the shoe 37 is completely engaged.
  • the shoe 38 is about to disengage; as soon as it rests freely on the slab 26, it will be returned to the position of the shoe 35.
  • the sliding of the structure is practically continuous and with no loss of time.
  • the continuity of advance is limited only by the jack stroke, which can be made very long, or by the time required for connecting successive sections of the bridge deck.
  • the operations of lifting and lowering the deck are replaced simply by shifting a slide shoe from the exit end to the inlet end of the slide members 22.
  • the longitudinal profile of the slide member 23 may include a central rectilinear part between two curved parts.
  • the longitudinal profile need not necessarily be strictly symmetrical with respect to the pier axis but may, for example, have a slight incline in the direction of introduction of the shoes and a more sloping incline in the portion where the shoes are disengaged.
  • Apparatus for advancing a prestressed concrete bridging structure resting on abutments and intermediate piers the structure consisting of prestressed concrete sections cast successively at a prefabrication zone and successively connected to one another with prestressed connection between two adjacent sections, the structure being progressively advanced from one of said abutments after each addition of a new section by sliding on slide surfaces disposed at the top of each pier or abutment, supports interposed between the structure and the slide surface, said supports comprising a bottom sliding surface in contact with the slide surface and a top surface having a high coefficient of friction in contact with the structure, the improvement in which the sliding surface of each pier or abutment includes a cylindrical surface whose generatrices are perpendicular to the axial plane of the structure and whose directn'x is a continuous curve the concavity of which faces the corresponding pier or abutment, the sliding of the structure being produced by continuous thrusts of an amplitude greater than the dimension of the pier heads in the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
US58864A 1969-08-26 1970-07-28 Method of advancing a prestressed concrete bridging structure Expired - Lifetime US3685224A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6929212A FR2056058A6 (enrdf_load_stackoverflow) 1969-08-26 1969-08-26

Publications (1)

Publication Number Publication Date
US3685224A true US3685224A (en) 1972-08-22

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US58864A Expired - Lifetime US3685224A (en) 1969-08-26 1970-07-28 Method of advancing a prestressed concrete bridging structure

Country Status (9)

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US (1) US3685224A (enrdf_load_stackoverflow)
AT (1) AT315898B (enrdf_load_stackoverflow)
BE (1) BE753049R (enrdf_load_stackoverflow)
DE (1) DE2036924A1 (enrdf_load_stackoverflow)
ES (1) ES381965A2 (enrdf_load_stackoverflow)
FR (1) FR2056058A6 (enrdf_load_stackoverflow)
GB (1) GB1297397A (enrdf_load_stackoverflow)
LU (1) LU61574A1 (enrdf_load_stackoverflow)
NL (1) NL7012573A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4319374A (en) * 1977-12-06 1982-03-16 Dyckerhoff & Widmann Aktiengesellschaft Method of constructing a stayed girder bridge
US5920938A (en) * 1997-08-05 1999-07-13 Elcock; Stanley E. Method for rejuvenating bridge hinges
CN107489103A (zh) * 2017-08-08 2017-12-19 云南公投建设集团第六工程有限公司 大跨度钢箱梁吊索塔架辅助顶推施工方法
CN111041978A (zh) * 2019-12-11 2020-04-21 郑州第二市政建设集团有限公司 一种抗震墩柱结构

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2413815C2 (de) * 1974-03-22 1975-09-04 Dyckerhoff & Widmann Ag, 8000 Muenchen Verfahren zum Herstellen einer Schrägseilbrücke im abschnittsweisen freien Vorbau
DE2938029A1 (de) * 1979-09-20 1981-04-02 Polensky & Zöllner, 6000 Frankfurt Verfahren zum herstellen einer schraegseil- oder zuegelgurtbruecke
FR2551034B1 (fr) * 1983-08-22 1988-09-02 Gtm Ets Sa Dispositif de glissement pour translater des charges lourdes
FR2758835B1 (fr) * 1997-01-28 1999-04-02 Freyssinet Int Stup Systeme pour faire glisser le tablier d'un pont au sommet d'une pile
CN114908680B (zh) * 2022-05-13 2024-07-30 中南建设集团有限公司 一种装配式π型钢混组合梁快速预制安装施工方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4319374A (en) * 1977-12-06 1982-03-16 Dyckerhoff & Widmann Aktiengesellschaft Method of constructing a stayed girder bridge
US5920938A (en) * 1997-08-05 1999-07-13 Elcock; Stanley E. Method for rejuvenating bridge hinges
CN107489103A (zh) * 2017-08-08 2017-12-19 云南公投建设集团第六工程有限公司 大跨度钢箱梁吊索塔架辅助顶推施工方法
CN111041978A (zh) * 2019-12-11 2020-04-21 郑州第二市政建设集团有限公司 一种抗震墩柱结构
CN111041978B (zh) * 2019-12-11 2021-03-30 郑州第二市政建设集团有限公司 一种抗震墩柱结构

Also Published As

Publication number Publication date
NL7012573A (enrdf_load_stackoverflow) 1971-03-02
AT315898B (de) 1974-06-10
LU61574A1 (enrdf_load_stackoverflow) 1970-11-09
DE2036924A1 (de) 1971-03-25
BE753049R (fr) 1970-12-16
ES381965A2 (es) 1973-04-16
FR2056058A6 (enrdf_load_stackoverflow) 1971-05-14
GB1297397A (enrdf_load_stackoverflow) 1972-11-22

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